INGREDIENTS
1 cup
unsalted butter, at room temperature
1 cup
white sugar
2/3 cup
light brown sugar (, packed)
2
eggs
1 tsp
vanilla
3 1/4 cups
all-purpose flour
4 1 ounce packages
hot chocolate mix (not sugar-free; a total of about 1 cup of hot chocolate mix)
1 1/4 tsp
salt
1 1/4 tsp
baking soda
1 cup
milk chocolate chips
1 cup
semi-sweet chocolate chips
1 1/2 cups
mini marshmallows (, frozen (see note))